Currently GraphicsContext::isCALayerContext() returns false for all RemoteImageBuffers. This disallows compositing the 2D canvas elements when UseGPUProcessForCanvasRenderingEnabled is on.
Created attachment 422316 [details] Patch
*** Bug 220389 has been marked as a duplicate of this bug. ***
<rdar://problem/75070025>
Created attachment 422318 [details] Patch
Committed r273956: <https://commits.webkit.org/r273956> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422318 [details].